Strange disk messages in dmesg on OpenBSD 4.8/4.9 snapshot on a Sparcstation 20

I've been running OpenBSD on my Sun Sparcstation 20 for a couple of years now. It's the most stable and useful OS on this particular box.

I have had no problem up to OpenBSD 4.7, but when trying to install 4.8 and 4.9, I get this strange output in the dmesg about either the scsi disk controller and the hard drive and optical drive. When I run a dmesg, this is all I get (this is the content of dmesg.boot):

The system appears to run, but both the installation and boot of the system take much longer due to these messages cycling for so long.

I also couldn't get the installation sets off of the CD - I had to use FTP.

I've burned multiple CDs, and it's not the media. The messages persist on the running system. When I load and run OpenBSD 4.4 through 4.7, none of these messages appear. It's just 4.8 and the 4.9 snapshot I pulled a couple days ago.

It's the hard drive. I pulled the 35 GB Hitachi Ultrastar, popped in a 2 GB Seagate Barracuda, and OpenBSD 4.8's dmesg is fine. It must be something in the Hitachi drive that doesn't affect OpenBSD < 4.8. The rest of the SS20 is still fine with OpenBSD 4.8 (and presumably 4.9).

I'm going to install OpenBSD 4.7 and give myself (and eventually openbsd-misc) more time to figure this out.